[Yaffs] Question about metadata

Hi all,

I have a basic question. As we know the Chunkid will start from 0 to the max number of chunks in one block. And it will contiune from 0 to the next block. So how we can distinguish these different chunks in different block? Do we have a kind of "blockid" in yaffs? I did not see that in yaffs header. What kind of method can help doing the allocation ? Another question, i still do not know the function of sequence number. Thank you guys.

Alex